Sell a few and HODL more.
If you want to sell, don't sell all of it. Take profits but never leave that you're empty with Ethereum. I've already sold a few ETH and it's even under the price of $2k.
I have also the same goal of looking at those high price that you've mentioned that's why I'm still holding more.
If you sell then you have to pay for the transaction fee which is not good if you are looking to earn profit. If wanted to sell why not sell all to save from fee. Well, if you have huge amount of eth then fee is not a problem but for smaller amount then that is the problem your going to face. Well, I use an exchange and also a wallet that let me exchange to xrp and which let me save fee before buying and selling if i'm going to trade.